The Sig Sauer MCX Spear-LT is a semi-automatic pistol-configuration firearm chambered in .300 AAC Blackout with a 9-inch threaded barrel and a 30-round capacity. It has a Flat Dark Earth Cerakote finish and ships with a folding cane brace and polymer grips. The 9-inch barrel is threaded for suppressor or muzzle device use. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: MCX Spear-LT 
• Caliber: .300 AAC Blackout 
• Action: Semi Auto 
• Capacity: 30+1 rounds 
• Barrel Length: 9 inches (threaded) 
• Color/Finish: Flat Dark Earth (FDE) Cerakote 
   

Detailed Features 

• 9-inch threaded barrel compatible with suppressors and muzzle devices 
• Flat Dark Earth Cerakote finish on receiver 
• Folding cane brace for compact storage 
• 30-round magazine capacity 
• Polymer grips

Owners of the MCX Spear-LT in .300 AAC Blackout consistently point to the folding brace and compact 9-inch barrel as the practical appeal of the platform. The Cerakote FDE finish gets good marks for durability. Some buyers note the pistol-configuration paperwork involved with any future reconfiguration.

The MCX action has a reputation for reliable cycling with both supersonic and subsonic loads, which matters a lot to owners running this barrel length. Trigger feel is generally described as acceptable but not exceptional out of the box.

Value perception is mixed. The Spear-LT sits at a premium price, and some owners feel that premium is earned by the build quality and modularity; others find comparable performance at lower cost from competing platforms. The IR-optic-ready variant appeals to a specific buyer who already owns compatible night-vision equipment.